12. a. Daca i =7, r<7 , rezulta ca r∈{1,2,3,4,5,6}
b. D= C*I +r= 434 + r
r=1, D= 434+1=435
r=2, D=434+2=436
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r=6, D=434 +6=440
D∈ { 435, 436, 437, 438, 439, 440 }
16. a:8=37 rest r, r nr par, r<8 , rezulta r∈{2,4,6}
a= 37*8+r=296+r
a= 296+2=298
a= 296+4= 300
a= 296+6=302
⇒ a∈{ 298,300,302}
